1. The first and last term of an A.P are "a" and "l" respectively. If S is the sum of all the terms os the A.P and common difference is given by { l(square)-a(square) / k-(l+a) } , then k= 2. If the...

This are the questions i am stuck in :) 1) In an AP, the sum of the first 6 terms is 75 and the sum of the next 4 terms is 110. Find the eleventh term. 2) The ninth term of an AP is 28 and the sum of...

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